Filling nozzle



April 19, 1938. J, D, l-:LsoM

FILLING NOZZLE Filed sept. 4, 1937 sheets-sheet 1 April 19, 193s.

J. D. ELsoM FILLING NOZZLE Filed Sept. 4, 1957 3 Sheets-Sheet 2 J. D.ELSOM FILLING 'NOZZLE April 19, 1938.

Filed Sept. 4, 1957 3 Sheets-Sheet 3 NNN wm mwwmxw ww Patented Apr. 19,1938 PATENT OFFICE FILLING NOZZLE James v D. Elsom,

Evanston,

Ill., assignor of twenty-four percent to Lawrence E. Gould, andtwenty-four percent to Frank J. OBrien, both of Chicago, Ill.

Application September 4, 1937, Serial No. 162,467

I 'Z Claims.

My invention relates to lling nozzles and particularly to meansapplied'thereto, acting to autonriatica'lly4 interrupt the ow of liquidbeing delivered through the nozzle when the liquid in a container shallrise to a predetermined level.

In the lling of tanks with liquid fuel, it is desirable that meansshould be provided that will act automatically to interrupt the deliveryof liquid when the tank is filled to a level near the point of overiiow.A number of devices have been suggested for the purpose, but theoperation of nonevk thereof has been entirely satisfactory, certaininherent shortcomings being present that are overcome in the designherein illustrated.

An 'object of my invention is to provide mechanlsm that will operatewith certainty but will not operate to close the shut-off valve if dropsof liquid. that may occur from splashing within the tank, shall enterthe port located at the limit point. My device'is so designed that a'small amount of liquid entering the port will not interrupt the iiow ofliquid through the nozzle.

In general, my device includes a motor of some sort applied to theiilling nozzle, the motor serving to operate a piston, acting in acylinder havpress air during normal operation. A port is provided at thehigh level limit through which 1 liquid may 'be admitted to the cylinderand as' liquid is practically incompressible, the motor will beA sloweddown when the level of liquid reaches the port. The shut-oil.' valveprovided in the nozzle is maintained in open position by the exhaustpressure from the motor built up by reason o'f a restricted outlet therefor, and when the speed of the motor is substantially reduced, thevolume of exhaust air becomes less and consequently the pressure isreduced. This permits a spring to close the valve and stop the ilow ofliquid through the nozzle. vIn addition, means are provided, operated bythe valve for sounding an alarm.

'I'he invention will be more readily understoodI 'Ihe nozzle, asbestshown inFigs. 1 to. 3, comprises a delivery end I0, a body `portionII and a hose connecting end I2. Mounted within the body of the nozzleis a valve I3 held in closed position by a spring I4 and engaging a-bellows l5 at its lower end. A shell I6 encloses the bellows, the shellhaving a-bleeder port I'I. Air admitted through-the pipe I8 acts on thebellows, tending to compress the same and to open the valve, the pipe I8being connected to the exhaust passage I9 in the motor body.

The motor, indicated generally by the numeral 20, is supplied with airunder pressure through a pipe 2| delivered by a hose 22. Within themotor body is mounted a piston 23, a reversing valve 24 and a handoperated shut-off valve 25.

The air motor is of a conventional type, the operation of which is asfollows:

Air admitted through the pipe 2| is delivered to the passage 2 Iaf Fig.7, thence to the hand operated valve 25 through which the air isconducted to a passage 3|; from this point the air is delivered to thereversing valve 24. When the reversing valve is in the position shown inFig. 6, the air from passage 3| enters cross-over space 33 andr thencethrough passageway 34 into the right hand end of the cylinder for thepiston 23. This causes the piston to move tothe left. At this time, dueto the reversal of position of the valve 24, thepassageway 35 leadingfrom the left hand end of the cylinder is connected to the exhaust port'36 through the cross-over space 3'I in the valve 24, the port 36openinginto the atmosphere. When the air enters the right hand end ofthe cylinder as above described, it causes the piston 23 to move to theleft, as shown in dotted lines in Fig. 6. In doing this the air suppliedthrough the passage 3I-in the position of cross-over 38 in the pistonand thence through the passageway 39 to the right hand end of thereversing valve 24 thereby shifting it to the left. When in thisposition the air is delivered to the left hand end of the piston and theair in the right hand end of the cylinder isdiseharged through passage40, thence through cross-over 4I in the reversing valve and thence tothe exhaust passage 42, and to the pipe I8 connected to the spacesurrounding the bellows.

As a warning device that the valve is closed and the flow of liquidstopped, I provide a whistle indieated at 43 in Flg.`3, which isoperated as follows:

Mounted adjacent to the shut-'off valve I34 is a bracket carrying alever arm 44, one end of which overlies the valve and the other end un`derlies the plunger 35. 'I'he upper end of the plunger contacts the stemof a valve 46 controlling the passage of air from a passage 41, incommunication with the intake passage 2la, to a passage 48 that leads toa tube 49 through which the air is delivered to the Whistle. Of course,when thehand valve 25 is shifted, the whistle passage is closed. Thereciprocating piston 23 of the motor has a piston rod 26 connectedthereto, the rod passing through a gland into the discharge end of thenozzle and terminating in a piston 21. The piston operates in a cylinder28, having a small outlet or discharge port 29, thus forming anaircompressor in which air is compressed within the cylinder anddischarged through the restricted outlet. The inlet ports for the airare indicated at 30, these being located at the level to which it isdesired to fill the tank or other container.

The arrangement is such that when the compressor is operated on air, themotor will reciprocate freely and the exhaust therefrom, which isdirected through the pipe I8, will act on the bellows I5 to maintain thevalve in open position; this for the reason that the air cannot escapethrough the bleeder port I1 fast enough to avoid building up ofpressure. When, however, liquid in any substantial quantity enters theports into the cylinder 28, the speed of the motor will be very greatlyreduced due to the difliculty in Yejecting liquid through the restrictedoutlet 29 from the cylinder. Consequently the volume of exhaust air willbe proportionately reduced and suicient thereof can escape to reduce thepressure to a point that will enable the spring I4 to close theshut-oil' valve.

It will be noted that in the event a small amount of liquid enters thecompressor, as by splashing, it may momentarily slow down the motor, butinasmuch as the liquid will be immediately expelled, the normaloperation will be resumed. However, if liquid continuously enters theair inlet ports to the compressor it cannot be expelled quickly and themotor speed will be greatly reduced.

It should be understood that the apparatus shown is illustrated only andmay be varied as to substantially all of the instrumentalities withoutdeparture from the inventive idea. Therefore, the scope of theinvention,should be determined from the appended claims.

I claim:

1. In combination, a filling nozzle having a shut-olf valve, a motorcarried by said nozzle, an air compressor operated by the motor. meansproviding a liquid inlet to the compressor, said inlet being located ata point on the nozzle representing a filling limit, and means operatedas a result of a reduction of speed of the motor following admission ofliquid to the compressor for closing said Valve.

2. In combination, a filling nozzle having a shut-olf valve, an aircompressor and means for operating the same, means providing a liquidinlet to the compressor, said inlet being located at the filling limitof the nozzle, and means operated by a reduction of speed of thecompressor-operating means, following admission of liquid to thecompressor for closing said valve.

3. In means for automatically interrupting the 110W of liquid through anozzle, the combination with the nozzle body of a cylinder and pistonadapted to compress air and to discharge the same through a restrictedopening, said nozzle body having a part located at a predeterminedshut-off level and acting as a liquid inlet to said cylinder when thelevel of liquid rises to said part, a motor for reciprocating saidpiston, a shut-olf valve in said nozzle, and means operated by areduction of speed of said motor lfollowing the entrance of liquid intosaid cylinder for actuating said valve to interrupt the flow of liquidthrough the nozzle.

4. In a device of the class described, the combination of a nozzle bodyhaving a shut-off valve, a reciprocating motor mounted on said body, anair compressor operated by said motor and having an air inlet, thecompressed air from which is discharged through a restricted outlet, theair inlet to said compressor being located at a point representing thefilling limit of the nozzle, and means controlled by a reduction of thenormal speed of said motor for effecting the closing of said valve.

5. In combination, a filling nozzle, a motor mounted thereon, a cylinderand piston located at a point near the discharge end of the nozzle, saidpiston being reciprocated by said motor to compress air in saidcylinder, means providing an inlet opening to said cylinder at a pointrepresenting the filling limit, whereby the entrance of liquid into saidcylinder effects a speed reduction of the motor, a shut-off valve in thenozzle and means operated as the result of the reduction of speed of themotor for closing said valve.

6. In combination, a nozzle, an air motor mounted thereon, an aircompressor operated by said motor and located near the discharge end ofthe nozzle, means providing an inlet opening to the compressor at apoint near the discharge end of the nozzle, a shut-off valve and meanssubject to the pressure of the exhaust air from said air motor forcontrolling said valve whereby upon a reduction of speed of -said motor,due to the entrance of liquid into the compressor, said valve is closed.

7. In combination, a nozzle having a' motor thereon, an air compressoroperated by said motor and located at a point near the discharge end ofthe nozzle and having an air inlet, the air inlet to the compressorbeing located at a point representing the filling limit of the nozzle, ashutoff valve in the nozzle, a bellows connected to the valve and meansoperated by a reduction of speed of said motor for varying the airpressure on said bellows to effect the closing of said valve followingthe admission of liquid into said compressor.

JAMES D. ELSOM.

